Genetic association between different criteria to define sexual precocious heifers with growth,carcass, reproductive and feed efficiency indicator traits in Nellore cattle using genomic information     

Martin Bonamy  Sabrina Kluska  Elisa Peripolli  Marcos Vinícius Antunes de Lemos  Sabrina Thaise Amorim  Roberto Jose Vaca  Raysildo Barbosa Lbo  Letícia Mendes de Castro  Carina Ubirajara de Faria  Fabio Borba Ferrari  Fernando Baldi 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2019,136(1):15-22

The aim of this study was to estimate genetic parameters for different precocious calving criteria and their relationship with reproductive, growth, carcass and feed efficiency in Nellore cattle using the single‐step genomic BLUP. The reproductive traits used were probability of precocious calving (PPC) at 24 (PPC24), 26 (PPC26), 28 (PPC28) and 30 (PPC30) months of age, stayability (STAY) and scrotal circumference at 455 days of age (SC455). Growth traits such as weights at 240 (W240) and 455 (W455) days of age and adult weight (AW) were used. Rib eye area (REA), subcutaneous fat thickness (SFT), rump fat thickness (RFT) and residual feed intake (RFI) were included in the analyses. The estimation of genetic parameters was performed using a bi‐trait threshold model including genomic information in a single‐step approach. Heritability for PPC traits was moderate to high (0.29–0.56) with highest estimates for PPC24 (0.56) and PPC26 (0.50). Genetic correlation estimates between PPC and STAY weakened as a function of calving age. Correlation with SC455, growth and carcass traits were low (0.25–0.31; ?0.22 to 0.04; ?0.09 to 0.18, respectively), the same occurs with RFI (?0.09 to 0.08), this suggests independence between female sexual precocity and feed efficiency traits. The results of this study encourage the use of PPC traits in Nellore cattle because the selection for such trait would not have a negative impact on reproductive, growth, carcass and feed efficiency indicator traits. Stayability for sexual precocious heifers (PPC24 and PPC26) must be redefined to avoid incorrectly phenotype assignment.  相似文献   

Influence of storage time and processing on chemical composition and in vitro ruminal fermentation of olive cake     

Carlos N. Marcos  Trinidad de Evan  Paloma García‐Rebollar  Carlos de Blas  Maria Dolores Carro 《Journal of animal physiology and animal nutrition》2019,103(5):1303-1312

Olive oil extraction generates olive cake (OC) that could be used in ruminant feeding. However, the chemical composition of OC is affected by multiple factors, being therefore highly variable. The objective of this study was to analyse the influence of storage time and further processing: crude, exhausted (subjected to a second oil extraction) and cyclone (obtained from a cyclone separator) on nutritive value of OC samples. Twelve samples (six crude and six exhausted) were obtained monthly from the same pond from 1 to 6 storage months, and nine samples (three crude, three exhausted and three cyclone) were obtained monthly from a different pond from 6 to 9 months storage. Chemical composition was analysed, and OC samples were fermented in vitro with sheep rumen fluid. Increasing storage time up to 6 months decreased sugars and total soluble polyphenols content but increased fibre content in OC. Dry matter effective degradability (DMED) decreased linearly (p < 0.001) by 35.9 and 45.5% as storage time augmented from 1 to 6 months for crude and exhausted OC, respectively. Crude OC had lower DMED values than exhausted OC (averaged values 0.255 and 0.294 g/g, respectively). Both potential production and rate of gas production were lower (p ≤ 0.018) in crude compared with exhausted OC, which was attributed to the high fat content of crude OC (≥86 g/kg dry matter). For samples stored longer than 6 months, cyclone had greater (p < 0.05) DMED than crude and exhausted OC (averaged values 0.207, 0.164 and 0.164 g/g, respectively). The results indicate that ruminal degradability of OC is reduced with advancing storage time, but only subtle changes were observed during the first two months. Cyclone showed greater degradability than crude and exhausted OC, but differences between crude and exhausted OC became negligible after five storage months.  相似文献   

Comparison of demographic data,disease severity and response to treatment,between dogs with atopic dermatitis and atopic‐like dermatitis: a retrospective study     

Larissa S. Botoni  Sheila M. F. Torres  Sandra N. Koch  Marcos B. Heinemann  Adriane P. Costa‐Val 《Veterinary dermatology》2019,30(1):10-e4

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Unilateral polydactyly in two foals     

A. Gray  S. Marcos  A. Thomas  O. M. Lepage 《Equine Veterinary Education》2019,31(9):462-467

This case report describes unilateral supernumerary digits of the forelimb in two foals. A diagnosis of polydactyly of the right forelimb in one case and of the left forelimb in the other was made by clinical examination and radiographic interpretation. Surgical excision was performed under general anaesthesia with a good cosmetic and functional outcome in both cases.  相似文献   

Nutritional evaluation and productivity of supplemented sheep grazing in semiarid rangeland of northeastern Brazil     

Araújo  A. R.  Rodriguez  N. M.  Rogério  Marcos Cláudio Pinheiro  Borges  I.  Saliba  E. O. S.  Santos  S. A.  Pompeu  R. C. F. F.  Fernandes  F. E. P.  Monteiro  J. P.  Muir  J. P. 《Tropical animal health and production》2019,51(4):957-966

Tropical Animal Health and Production - Sheep production systems in Brazilian caatinga rangelands require supplementation adapted to changes in floristic and chemical composition as dry seasons...  相似文献   

Lethal concentration of Cymbopogon citratus (Poaceae) essential oil for Dolops discoidalis and Argulus sp. (Crustacea: Argulidae)     

Elcimara Cardoso Pereira  Elzamara Castro Oliveira  Elen Monique Oliveira Sousa  Hugo Napoleão Pereira Silva  Lincoln Lima Corrêa  Rosa Helena Veras Mourão  Marcos Tavares-Dias  Lenise Vargas Flores Silva 《Journal of fish diseases》2020,43(12):1497-1504

This study investigated the acute toxicity (LC_50-24 hr) effects of the essential oil of Cymbopogon citratus for adult Argulus sp. and Dolops discoidalis, before and during oviposition. In vitro acute toxicity (LC_50-24 hr) was tested using 20, 40, 60, 80, 100, 120, 140 and 160 μg/L of C. citratus essential oil, and two control groups (one with cultivation tank water and one with cultivation tank water + alcohol) were used. Specimens of Argulus sp. and D. discoidalis submitted to acute toxicity were evaluated using histological procedures. The major chemical compounds of C. citratus essential oil were geranial (47.5%), neral (35.6%) and myrcene (6.7%). The LC_50-24 hr for Argulus sp. adults was 67.97 μg/L, while for D. discoidalis it was 59.55 µg/L. In the oviposition of both species of argulids, maximum mortality began with treatments of 140 μg/L, while the LC_50-24 hr for Argulus sp. and D. discoidalis was 83.98 μg/L and 82.48 μg/L, respectively. In both argulid species exposed to C. citratus essential oil, morphological alterations were observed only in the eyes, and they occurred in the ommatidium and rhabdomeres and were dependent on the concentration of C. citratus essential oil and the parasite species.  相似文献   

Application of morphometric measures in estimation of body weight and discrimination of Astyanax lacustris and Astyanax fasciatus     

Hortência Aparecida Botelho  Aline de Assis Lago  Alisson Lucrecio da Costa  Adriano Carvalho Costa  Rafael Vilhena Reis Neto  Zoraia Silva  Fagner Machado Ribeiro  Marcos Barcellos Caf  Rilke Tadeu Fonseca de Freitas 《Aquaculture Research》2019,50(9):2429-2436

The objective of this study was to verify the direct and indirect correlation between morphometric measures, ratios, body weight and yield in two lambari species Astyanax lacustris and Astyanax fasciatus and whether the discriminant analysis is capable of separating and allocating the species. We used 102 lambari yellow tail and 60 lambari red tail. The fish were weighed and submitted to the evaluation of the morphometric measurements. The direct and indirect effects were evaluated by the method of track analysis, considering weight at slaughter, weight of body parts and body yields as dependent variables and measures and morphometric ratios as explanatory variables. Astyanax lacustris presented higher height and body width, carcass yield and trunk, while A. fasciatus presented higher head yield and viscera weight. The discriminant analysis was able to classify 79.5% of the two species. Track analysis demonstrated that the morphometric measurements can be used for estimation of body and body components’ weight in A. lacustris and A. fasciatus. However, regarding the corporal yield; the morphometric measures were insufficient to explain the yield variations of the species.  相似文献   

MALDI-TOF MS identification of Prototheca algae associated with bovine mastitis     

Carlos E. Fidelis  Manoela Franke  Letícia C. R. de Abreu  Tomasz Jagielski  Mrcio G. Ribeiro  Marcos V. dos Santos  Juliano L. Gonalves 《Journal of veterinary diagnostic investigation》2021,33(6):1168

We evaluated the use of MALDI-TOF MS for the identification of 3 major, dairy-associated Prototheca species, namely, Prototheca bovis (formerly P. zopfii genotype 2), P. blaschkeae, and P. ciferrii (formerly P. zopfii genotype 1). The MALDI-TOF MS spectra established for those species were introduced into the reference spectra library of the Bruker Biotyper MALDI-TOF MS analysis software. Next, 31 Prototheca isolates from Holstein cows with mastitis, from herds located in the midwestern area of São Paulo State, Brazil, were subjected to MALDI-TOF MS profiling. MALDI-TOF MS allowed identification of 22 of 27 P. bovis and 3 of 4 P. blaschkeae isolates with scores >2.0, with 5 of 27 P. bovis and 1 of 4 P. blaschkeae isolates identified only to the genus level. With our extended algae database, MALDI-TOF MS can contribute to quick and effective speciation of Prototheca from mastitis cases.  相似文献   

Spinosad‐mediated effects on the walking ability,midgut, and Malpighian tubules of Africanized honey bee workers          下载免费PDF全文

Marcos Pereira Lopes  Kenner Morais Fernandes  Hudson Vaner Ventura Tomé  Wagner Gonzaga Gonçalves  Franciane Rosa Miranda  José Eduardo Serrão  Gustavo Ferreira Martins 《Pest management science》2018,74(6):1311-1318

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First record of infection by Trypanosoma sp. of Colossoma macropomum (Serrasalmidae), a neotropical fish cultivated in the Brazilian Amazon     

Roselene Nogueira Rodrigues  Marcos Sidney Brito Oliveira  Marcos Tavares-Dias 《Journal Of Applied Aquaculture》2018,30(1):29-38

Fish farming has grown rapidly in Brazil over the last two decades, due in part to the availability of water and species with potential for cultivation, such as Colossoma macropomum. This farmed fish, however, can be affected by parasitic infections with high mortality rates (>35%). The main objective of the present study was to describe the first occurrence of the Trypanosoma species in Colossoma macropomum, which occurred in fish cultured in the Brazilian Amazon region, as well as to morphologically characterize the trypomastigotes and the impact of these hemoparasites on the body condition of the hosts. The trypanosomes found in the blood of Colossoma macropomum were morphologically characterized by the size of the trypomastigote form, indicating the presence of only one morphotype. Of the 39 hosts examined from one fish farming, 41.0% were infected by Trypanosoma sp., with low levels of infection (mean blood density of 3.7/μL). The condition factor of the asymptomatic hosts was not affected by hemoparasitism. There was no correlation between the abundance of Trypanosoma sp. and the condition factor and size of the hosts. Finally, our understanding of host-parasite interactions and the detection of emerging diseases are fundamental for aquaculture.  相似文献